Conjurors get an instant cast 3 attack stoneskin ( 2 attack stoneskin from aa line also but 2second cast), aswell as a unbreakable snare for 25seconds. The only problem is a necromancer pet is going to do more damage unless a conjuror has 3-6seconds to cast blazing manifestation, elemental unity. Now in most pvp situtations solo you have no time to cast those two AND planeshift but if you can you can win a lot of battles given you have 40 meter range before engaging and all 3 buffs up.
~watch this video
LivePvP - Make Digital History. by me and watch the fights against Maleek, Precandce, and Gagamel and you'll see the ideal situtation with all buffs up how deadly a conjuror is.
Now ive never played a tier 8 necro but im going assume the easiest way to kill someone is to get a fear off the bat, maybe root and then unleash undead horde, drain life, and the consumption thing early off.
Get your self some stoneskin proc items (belt 10% from some mob in fens, 3% earring from some quest in kylong, shoulders from outer seb merchant with 10% proc chance and you will have more survivability)